6 thoughts on “Bicolored Antvireo (Dysithamnus occidentalis): Revise global status?”
The window for consultation is now closed and we are unable to accept any more comments until 18 July 2022. We will now analyse and interpret the new information, and we will post a preliminary decision on this species’ Red List status on this page on 18 July 2022, when discussions will re-open.
Based on available information, our preliminary proposal for the 2022.2 Red List would be to adopt the proposed classifications outlined in the initial forum discussion.
There is now a period for further comments until the final deadline on 24 July 2022, after which the recommended categorisations will be put forward to IUCN. The final 2022.2 Red List categories will be published on the BirdLife and IUCN websites in December 2022, following further checking of information relevant to the assessments by both BirdLife and IUCN.
The following comment has been submitted by Manuel Sánchez-Nivicela on 12 July 2022 while the discussion Forum was temporarily closed:
“With this species, it’s a bit difficult. Its altitudinal range and habitat preferences are in both sides of the Andes in Ecuador, one of those, heavily damaged (Chocó-Andes) on northwest. BirdLife Int consider this rare and poorly known species as a Chocó Endemic bird (race occidentalis) and endemic of Ecuador-Peru East Andes, too (race punctitectus). In the entire distribution of this Antvireo, habitat loss it’s present due to mining, logging, agriculture and infrastructure. Also, the altitudinal distribution range -at least in Ecuador-, it’s quite narrow: 1500m to ~2500m. Despite those multiple and concentrated records in Colombia (E.g., Tatamá). The distribution of Bicolored Antvireo, it’s fragmented following the montane regions down south to Ecuador and nearest northern Peru (see eBird). Also, it’s important to rise a cautionary context, the taxonomy of this species and its subspecies distributed in both sides of the Andes, needs an assessment (see: Remsen et al. 2022. SACC). Moreover, this species survives in forests where other rare, endangered and restricted species are present (Eg. Jocotoco Antpitta in the amazon basin or Chocó-Andean endemic birds on west). This can indicate that Bicolored Antvireo should be treated as Vulnerable as a cautionary status. Finally, in Ecuador, Freile et al (2019) considered this species as: Endangered C2a(i), based on the lack of information of mature individuals or couples reported in the entire distribution, we can suggest a downgrading of category. On eastern Ecuador, in two well visited areas by birders or birdwatchers, the reports of this Thamnophiliid are very rare. And this particular condition can be a good signal to reassess Peruvian Antpitta which share distribution with this Antvireo and it’s poorly known and less reported than Bicolored Antvireo (see eBird), but considered Near Threatened, globally.”
The following comment has been submitted by Manuel Sánchez-Nivicela on 12 July 2022 while the discussion Forum was temporarily closed:
“corrigenda: on this line “[…] Endangered C2a(i), based on the lack of information of mature individuals or couples reported in the entire distribution, we can not suggest a downgrading of category. On eastern Ecuador, in two well visited areas by birders or birdwatchers, the reports of this Thamnophiliid are very rare.” *I wanted to say “we can not” and no “we can”. Sorry,”
Many thanks to everyone who has contributed to this discussion. We greatly appreciate the time and effort invested in commenting. The window for consultation is now closed and we are unable to accept any more comments. We will analyse and interpret the new information, and we will post a final decision on this species’ Red List status on this page on 1 August 2022.
Recommended categorisation to be put forward to IUCN
The final categorisation for this species has not changed. Bicolored Antvireo is recommended to be listed as Near Threatened, approaching the threshold for listing as threatened under Criterion C2a(i). It is recognised that the population size is small; however, the current level of data quality only allows to suspect a population reduction and as such is insufficient to justify a listing as threatened under Criterion C.
Many thanks for everyone who contributed to the 2022.2 GTB Forum process. The final 2022.2 Red List categories will be published on the BirdLife and IUCN websites in December 2022, following further checking of information relevant to the assessments by both BirdLife and IUCN.
The window for consultation is now closed and we are unable to accept any more comments until 18 July 2022. We will now analyse and interpret the new information, and we will post a preliminary decision on this species’ Red List status on this page on 18 July 2022, when discussions will re-open.
Preliminary proposal
Based on available information, our preliminary proposal for the 2022.2 Red List would be to adopt the proposed classifications outlined in the initial forum discussion.
There is now a period for further comments until the final deadline on 24 July 2022, after which the recommended categorisations will be put forward to IUCN. The final 2022.2 Red List categories will be published on the BirdLife and IUCN websites in December 2022, following further checking of information relevant to the assessments by both BirdLife and IUCN.
The following comment has been submitted by Manuel Sánchez-Nivicela on 12 July 2022 while the discussion Forum was temporarily closed:
“With this species, it’s a bit difficult. Its altitudinal range and habitat preferences are in both sides of the Andes in Ecuador, one of those, heavily damaged (Chocó-Andes) on northwest. BirdLife Int consider this rare and poorly known species as a Chocó Endemic bird (race occidentalis) and endemic of Ecuador-Peru East Andes, too (race punctitectus). In the entire distribution of this Antvireo, habitat loss it’s present due to mining, logging, agriculture and infrastructure. Also, the altitudinal distribution range -at least in Ecuador-, it’s quite narrow: 1500m to ~2500m. Despite those multiple and concentrated records in Colombia (E.g., Tatamá). The distribution of Bicolored Antvireo, it’s fragmented following the montane regions down south to Ecuador and nearest northern Peru (see eBird). Also, it’s important to rise a cautionary context, the taxonomy of this species and its subspecies distributed in both sides of the Andes, needs an assessment (see: Remsen et al. 2022. SACC). Moreover, this species survives in forests where other rare, endangered and restricted species are present (Eg. Jocotoco Antpitta in the amazon basin or Chocó-Andean endemic birds on west). This can indicate that Bicolored Antvireo should be treated as Vulnerable as a cautionary status. Finally, in Ecuador, Freile et al (2019) considered this species as: Endangered C2a(i), based on the lack of information of mature individuals or couples reported in the entire distribution, we can suggest a downgrading of category. On eastern Ecuador, in two well visited areas by birders or birdwatchers, the reports of this Thamnophiliid are very rare. And this particular condition can be a good signal to reassess Peruvian Antpitta which share distribution with this Antvireo and it’s poorly known and less reported than Bicolored Antvireo (see eBird), but considered Near Threatened, globally.”
The following comment has been submitted by Manuel Sánchez-Nivicela on 12 July 2022 while the discussion Forum was temporarily closed:
“corrigenda: on this line “[…] Endangered C2a(i), based on the lack of information of mature individuals or couples reported in the entire distribution, we can not suggest a downgrading of category. On eastern Ecuador, in two well visited areas by birders or birdwatchers, the reports of this Thamnophiliid are very rare.” *I wanted to say “we can not” and no “we can”. Sorry,”
Many thanks to everyone who has contributed to this discussion. We greatly appreciate the time and effort invested in commenting. The window for consultation is now closed and we are unable to accept any more comments. We will analyse and interpret the new information, and we will post a final decision on this species’ Red List status on this page on 1 August 2022.
Recommended categorisation to be put forward to IUCN
The final categorisation for this species has not changed. Bicolored Antvireo is recommended to be listed as Near Threatened, approaching the threshold for listing as threatened under Criterion C2a(i). It is recognised that the population size is small; however, the current level of data quality only allows to suspect a population reduction and as such is insufficient to justify a listing as threatened under Criterion C.
Many thanks for everyone who contributed to the 2022.2 GTB Forum process. The final 2022.2 Red List categories will be published on the BirdLife and IUCN websites in December 2022, following further checking of information relevant to the assessments by both BirdLife and IUCN.